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地球学报  2011 

三江北段纳日贡玛花岗闪长斑岩成岩时代的确定及地质意义

DOI: 10.3975/cagsb.2011.02.03

Keywords: 花岗闪长斑岩,铜钼矿,成岩时代,41.44±0.23Ma,印度板块与亚洲板块的碰撞时间,三江北段

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Abstract:

纳日贡玛斑岩型铜钼矿是近年来在三江北段发现的与侵入岩有关的斑岩型铜钼矿。作者首次利用锆石U-Pb方法测得纳日贡玛花岗闪长斑岩的形成年龄为41.44?0.23Ma,属于喜马拉雅早期。纳日贡玛斑岩型铜钼矿成矿主要在40.8?0.4Ma~40.86?0.85Ma之间。在多期热液叠加,多期成矿作用中,纳日贡玛斑岩型铜钼矿的热液应是纳日贡玛黑云花岗斑岩(41.53?0.24Ma~43.8?0.4Ma)、纳日贡玛花岗闪长斑岩(41.44?0.23Ma)和纳日贡玛斜长花岗斑岩(41.00?0.18Ma)共同提供的。由于该区有较多的中酸性岩体存在,因而,这些侵入体的形成年龄确定,为印度板块与亚洲板块在65~45Ma碰撞提供依据,对于在该区寻找斑岩型铜钼矿不仅有重要的理论意义,而且有重要的现实意义。

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